BURST CONTROL DEVICE AND BURST CONTROL METHOD FOR RESONANT CONVERTER

• Main Authors: CHEN JIAN, MURATA KOUJI
• Format: Patent
• Language: Chinese; English
• Published: 17.04.2020
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The present invention prevents noise that is generated during burst control of a resonant converter as a result of a burst cycle entering an audible-frequency cycle. A switching period of the burst cycle is constituted of three pulses: a start pulse (SP) for turning a low-side switching element (Q2) on, a main pulse (MP) for turning a high-side switching element (Q1) on, and an end pulse (EP) forturning the switching element (Q2) on. In a switching stop period, a burst stop period is set according to the weight of a load. When the burst cycle has approached a cycle of a frequency close to anupper limit of audible frequencies, a second OFF threshold voltage (Vth2) of the main pulse (MP) is set to be the same as a first OFF threshold voltage (Vth1) of the start pulse (SP), and an ON widthof the main pulse (MP) is shortened, thereby reducing the energy that is sent to a secondary side of a transformer (T) and shortening the burst cycle. 本发明提供一种谐振型转换器的突发脉冲控制装置及突发脉冲控制方法，防止在谐振型转换器的突发脉冲控制时突发脉冲周期进入可听频率的周期而产生振铃。突发脉冲周期